Knallgas and Knallgas-Steam Mixtures at High Initial Temperature and Pressure. Calculated Detonation Parameters and Adiabatic Constant-Volume Explosion Properties.

1959 ◽  
Vol 4 (2) ◽  
pp. 136-142 ◽  
Author(s):  
J. A. Luker ◽  
P. L. McGill ◽  
L. B. Adler
Keyword(s):  
Initial Temperature ◽  
Constant Volume ◽  
Detonation Parameters ◽  
Temperature And Pressure ◽  
High Initial Temperature

Laminar burning velocity of microalgae oil/RP-3 premixed flame at elevated initial temperature and pressure

Fuel ◽  
2022 ◽  
Vol 309 ◽  
pp. 122081
Author(s):  
Yu Liu ◽  
Wu Gu ◽  
Jinduo Wang ◽  
Hongan Ma ◽  
Nanhang Dong ◽  
...  
Keyword(s):  
Initial Temperature ◽  
Burning Velocity ◽  
Premixed Flame ◽  
Laminar Burning Velocity ◽  
Microalgae Oil ◽  
Temperature And Pressure

On the equivalent effect of initial temperature and pressure coupling on the flame speed of methane premixed combustion under dilution

Energy ◽  
2020 ◽  
Vol 207 ◽  
pp. 118269 ◽  
Author(s):  
Zhiqiang Han ◽  
Zhennan Zhu ◽  
Wenbin Yu ◽  
Kun Liang ◽  
Zinong Zuo ◽  
...  
Keyword(s):  
Initial Temperature ◽  
Flame Speed ◽  
Premixed Combustion ◽  
Equivalent Effect ◽  
Temperature And Pressure

Synthesis of a Novel Intumescent Flame Retardant Oligomer and its Application in ABS Copolymer

2011 ◽  
Vol 391-392 ◽  
pp. 204-208
Author(s):  
Xiao Ping Hu ◽  
Yu Yang Guo ◽  
Quan Min Xu ◽  
Hui Min Heng ◽  
Liang Jun Li
Keyword(s):  
Flame Retardant ◽  
Initial Temperature ◽  
Oxygen Index ◽  
Intumescent Flame Retardant ◽  
Char Residue ◽  
Mass Ratio ◽  
Limiting Oxygen Index ◽  
Ul 94 ◽  
Combustion Behaviors ◽  
High Initial Temperature

A novel intumescent flame retardant oligomer containing phosphorous-nitrogen structure (PSPTR) was synthesized and characterized by Fourier Transform Infrared (FTIR) and Mass Spectrometry (MS). The thermal behavior of PSPTR was investigated by thermogravimetric analysis (TGA). The TGA data shows that PSPTR has a high initial temperature of thermal degradation and a high char residue of 41.18wt% at 700 . A novel intumescent flame retardant (IFR) system, which is composed of PSPTR and novolac phenol (NP), was used to impart flame retardancy of ABS. The combustion behaviors of the ABS/IFR composites were investigated by Limiting Oxygen Index (LOI) and UL-94 tests. When the content of IFR (PSPTR:NP=1:1 mass ratio) is 30 wt%, the LOI value of ABS/IFR reaches 28.2, and the vertical burning test reaches UL-94 V-1 rating.

scholarly journals Experimental Study and Kinetic Modeling of Laminar Flame Propagation in Premixed Stoichiometric n-butane-air Mixture

2019 ◽  
Vol 70 (4) ◽  
pp. 1125-1131 ◽  
Author(s):  
Venera Giurcan ◽  
Maria Mitu ◽  
Domnina Razus ◽  
Dumitru Oancea
Keyword(s):  
Initial Temperature ◽  
Laminar Flame ◽  
Early Stage ◽  
Kinetic Modelling ◽  
Pressure Rise ◽  
Activation Parameters ◽  
Similar Data ◽  
Spherical Vessel ◽  
Spherical Flames ◽  
Temperature And Pressure

The laminar burning velocities and propagation speeds of stoichiometric n-butane-air mixture were obtained for outwardly propagating spherical flames by measurements of pressure rise during the early stage of propagation in a spherical vessel. The experiments were carried out at various initial pressures within 0.3 and 1.2 bar, and various initial temperatures within 298 and 423 K. The experimental laminar burning velocities were compared with those provided by the detailed kinetic modelling based on Warnatz mechanism for combustion of C1-C4 hydrocarbons, using INSFLA package. The baric and thermal coefficients of laminar burning velocities, calculated from their dependence on initial temperature and pressure, were compared with coefficients characteristic for other fuel-air mixtures. The overall activation parameters (reaction order and activation energy) are reported and discussed in comparison with similar data characteristic for alkane-air flames.

scholarly journals First-Order Phase Transformation at Constant Volume: A Continuous Transition?

Entropy ◽  
2021 ◽  
Vol 24 (1) ◽  
pp. 31
Author(s):  
Víctor F. Correa ◽  
Facundo J. Castro
Keyword(s):  
Phase Transition ◽  
Heat Capacity ◽  
Order Phase Transition ◽  
Pressure Range ◽  
Constant Volume ◽  
Continuous Transition ◽  
First Order ◽  
First Order Phase Transition ◽  
Temperature And Pressure ◽  
First Order Phase

We describe a first-order phase transition of a simple system in a process where the volume is kept constant. We show that, unlike what happens when the pressure is constant, (i) the transformation extends over a finite temperature (and pressure) range, (ii) each and every extensive potential (internal energy U, enthalpy H, Helmholtz energy F, and Gibbs energy G), and the entropy S is continuous across the transition, and (iii) the constant-volume heat capacity does not diverge during the transition and only exhibits discrete jumps. These non-intuitive results highlight the importance of controlling the correct variables in order to distinguish between continuous and discontinuous transitions. We apply our results to describe the transition between ice VI and liquid water using thermodynamic information available in the literature and also to show that a first-order phase transition driven in isochoric condition can be used as the operating principle of a mechanical actuator.

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